The conventional wisdom has been that transportation in our region was responsible for about a third of our Greenhouse Gas Emissions.
Metro has just commissioned a new inventory of emissions, and came up with a lower number, about 25%.
Of that, about 3/5ths is “local passenger traffic” (i.e., cars) and 2/5ths is our long distance travel (planes, trains, etc.). Transit is a fraction of a percent and local freight is small as well.
The interesting finding in Metro’s inventory is that “materials” make up almost half of emission sources. Materials include the stuff you buy (that flatscreen) and the food you eat. Interestingly, when you trace it back, about a quarter of the emissions from those materials are from transportation (getting them to you – so long-distance freight becomes significant).
Food for thought.